I guess i don't have a hard time believing the parent. I can imagine some college-aged youngsters projecting machismo/signalling to their social group and not yet having the maturity to reflect on their actions, indeed especially in the context of changing social norms and how they'd be perceived 50 years down the line. In university i had numerous flatmates or friends-of-flatmates who, upon discovering i'm a vegetarian, would appear to take delight in smugly telling me about how they would eat an extra steak on my behalf, or perhaps explaining some graphic detail about animal cruelty. I learned to be unflappable and simply leave the conversation at that point so as not to reward them with an emotional reaction, but all i'm trying to say is, i can totally imagine what the parent poster talks about. Thankfully though, these days i am blessed to have friends and colleagues who are both more self-aware and creative in the ways they crack jokes :).